+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187653 (2007 EN31) Classification: Outer Main-belt Asteroid          SPK-ID: 2187653 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04845176649013422 4.8991e-08   a 3.233400602192379 3.2845e-08 au q 3.076736631245894 1.6886e-07 au i 3.977036023741633 4.7672e-06 deg node 107.7874036334372 7.3689e-05 deg peri 297.0712264020655 9.6332e-05 deg M 237.2181167815567 6.7391e-05 deg tp 2459924.801673543384 (2022-Dec-11.30167354) 0.00040353 TDB period 2123.673262216675 5.81 3.2358e-05 8.859e-08 d yr n .1695176025450519 2.5829e-09 deg/d Q 3.390064573138863 3.4436e-08 au   Orbit Determination Parameters    # obs. used (total)      388      data-arc span      9270 days (25.38 yr)      first obs. used      1995-02-06      last obs. used      2020-06-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54225      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 13:53:18   Additional Information  Earth MOID = 2.08762 au   Jupiter MOID = 1.83313 au   T_jup = 3.180  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.53   n/a E2021B55   diameter diameter 4.733 km 0.648 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.055   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   187653 (2007 EN31)          Discovered 2007-Mar-10 by Spacewatch at Kitt Peak Reference: 20080520/Numbers.arc Last Updated: 2008-05-22 [ show close-approach data ] Alternate Designations  2007 EN31 = 1996 GN13  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 21:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin